The fluctuation in polling figures between Theresa May and Jeremy Corbyn between August 2016-present

The poll came as Mr Corbyn yesterday once more vowed to “root out” anti-Semites within Labour. And the urged actress Maureen Lipman to come in for talks after she savaged the Labour leader over the weekend.

Both the PM and the Labour leader's handling of the Russia spy poisoning attack, which left Sergei and Yulia Skripal in a critical condition, has affected the recent approval ratings

By mid-March the two leaders appeared level with the PM on -15 and Corbyn on -19.

Of the 3,298 polled by YouGov many saw the attempted murder of Sergei and Yulia Skripal in March as a chance for Theresa May to appear Prime Ministerial both at home and globally.

Over half of Brits polled said she had handled the crisis well compared to a mere 18 per cent who said the same of the Labour leader.

Corbyn was also dealt a further blow to his approval ratings as only 15 per cent gave a nod to his handling of the current anti-Semitism row compared to 46 per cent who believe he has handled it badly.

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Labour's own popularity has also suffered as a result of the blazing row with the party's net favourability score down from -8 to -17.

Despite the dip in approval ratings Corbyn is still seen better than his Labour predecessors who polled miserably.

Former PM Tony Blair has a current net favourability of -50 while Ed Miliband stands on -33 and Gordon Brown on -32.

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